Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba88bee5e3c8af81376ccc4a383f1be4fc3a055c73263d4d9620beb4568f158' 
  AND token = 'vnYeVVxTRRyQWk+8JIT87ZWf51v4xWYwI+UfDgdepGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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