Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfa6904e2a0645231f10f431df2d75a15a1aa2e3569a15b41a2d23d94550b97' 
  AND token = 'UElHqpYds8rB1JfBoypqC6W5QA5mknlkP5MpUS32Ysw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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