Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a292dd5ddfb543e83895d1f1c5506db6c798f39e0d2172f9a7248c561bc015' 
  AND token = 'C4IPaj/jdc9NgasodBMmuuA2rwzApSgSwythZrxuRMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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