SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c13dc2747f37679a5d2e43c5d1a741018d522f0f408b85aa8b81947d6bfd3333' 
  AND token = 'J2Z6XTKiGBDUVFsfD7fAUXRCr/DgIOFE5nvVNE501jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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