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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ede84e8c073aac4cb2238171cfbd5b72e5f0ef63cb225ae0a198b56988d0b8ac' 
  AND token = 'NKrf4XBg5ofr5CtSbvoiOe7ROQbhcbennPEhwb5bhWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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