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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abf76f159fd5dd3c2689a6e9ee9b5fce0d2766059caab97a8a9325113ed953bb' 
  AND token = 'HRtqMCImDjx4OPS/CZehOlm3VL+2sWT241ST5Cr4lx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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