Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '451cea20f0dcacc8b6b26f0b3a5caaa8fa462502bb98500bd7d605108a5e4830' 
  AND token = 'k87vd+iEW8jZAux4RLRdEN3TZA0DU3oNPqe/45Tk/Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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