Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b4e46e72a93337c5029c11bcdf3dc3c4130d3ad5f6a6b85f7774ed3fcfcba0a' 
  AND token = 'JcfgxmyHPbSHiCvIJ05Tkn1WZNML38FUdGCTv8uaJW4=' 
  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"
    }
  }
}