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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '426f068104f3abf4d7db428e53c124124d21bfcf402413f11f51a98090c469ef' 
  AND token = '+UsbGg3gtngNabmltrYKDTWIWSV/i9+HIhTGFX2XhtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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