Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0476f73a7d3250bc185b58f511b60cf7a479dbd8fbc8b45e1714b1dfde78d705' 
  AND token = 'k5vKlf9IQ5WO6iJB6SXyzAbVNtrdf64QyPL3YMNcFek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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