Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3a6d7b08b2e04119cfe34bc434c64b1e6d310b37ca682ddaa1e9410fece294' 
  AND token = 'LwYUZzk79HoixWWqWbqSmDpJwup/fFW4xcFVbIqtUmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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