Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850a13d7b8e7515d0bb0455e0e01caada8a3439c826261397c00614be4b52df3' 
  AND token = 'Y0priuOqavx9jye5JpmBEa31SevHco8iy6tBrEI4djQ=' 
  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"
    }
  }
}