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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b2bf17fac4ce67b7b05e83e5c4937ecbaae90104dbf51016c1b6a329605ad19' 
  AND token = '1Q1q2XfLFEjSSzmkxkkAUyx4d6AT+Wa4qx1Xx08ict8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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