Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b122c8fc0732353a9f4f4cf0abc6f86f8707dbd71611bfcbf5a7b0f822b482' 
  AND token = 'iijiaxE1ntdETFXj5kSN2qHP1h+C4NXycKfVnHOCuyA=' 
  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"
    }
  }
}