Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda8cbec52f5ad70d63fc16bf4503cac66f91987c2424e0d9c7798f5a7e7ff18' 
  AND token = '63HcGCt54WQd/vt1C8QodrsxMwkjBRxyfSPmuqeghTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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