Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec2983be5f8836f82f6366b40208647c771bf3a6a71e6fde6f3334b0b5ab8dc' 
  AND token = 'c0HsIIiSKnHwwmAw4XS6wtnnxSgYohZPvI9MmwMJJSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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