SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2716277afe82897b966f23d51829310e4e0a8db168f2db86f5f03cb0faa7595' 
  AND token = 'TxBiO6GGOmlARaV7f4gklgYxr1xl9jrvvYapS2Uh1Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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