Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e673cdfdd8e2c818eb4fc6ce5f686a21b4089b4615d5d7f0c99c4869725cd57b' 
  AND token = 'F5xigpdM8+k86zJo742vXnEmEcac/+GrHXEJKjRP8e4=' 
  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"
    }
  }
}