Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecdcbf8b2c60c8dc6f7fcc074e1822fb913ce33a7b55bc802ff5e3f73daeb8d2' 
  AND token = 'ITM+5uAY5htTpjlY1w9RKaLJX8+eZl+uEdHTG1l2NVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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