Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1a56d21354a2686b93b8c1a41901e811a400ad952ecaf0a34cd7743799fbd6' 
  AND token = 'BI98Ptpj1XuXBXG6PrualyFiwZF6d8Id8is2qUX19Mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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