Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c14ebb6afb9c0535be6e3b4e8a0fb831ba5059476aa9b2dbd62b1793173ff59' 
  AND token = '8PHT9BrVLaoUBySUb6aFdY6NyHXjXyQULg2Jzs9nG30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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