Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2330aad00d3698de3820f8de6f3970d2bb59d5a70704f7e6ddba479862f8b60a' 
  AND token = 'U9oqVurXhBS77FLRB8QEfivNkOla5xhprbz2FYvnunU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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