Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'def58460ba9e0247bc7a9d06e6ff290b793b1e41e2c1c4483dff5ddc511b268c' 
  AND token = 'LFhE7Ndx7ZRwi3D13hbuW6z2HKCNU6l9WZ0D7Afk1Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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