Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78cc743c14f4b1eee8c00433e9d2809f676a6cad776a530eda2559d5bcfcbb37' 
  AND token = '5GJT2hkJjhXOouBvnIUCuVAI65fGkuVQs44TN5WIoYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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