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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ac91549094b14bcaa7ca6518f8394592b0ce9005c0f842bfe4e9eceaf77b3c' 
  AND token = 'cAMlBTCzDNTVqMX2Fy+MyTmndlTr6mpeXHt09kPy5Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}