Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50519e0d376478a774f4abc727585670b0474d7f4a4528ba9e570b44ff04d1b4' 
  AND token = 'dFGCjYmJlMxwoLSJ2gAAdhucsJCFPLafWFL0IzkWDHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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