Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685f3aa045dd460b956b0ad104ee3e0294ec21acf63bf9e7d5d67d290f775d05' 
  AND token = 'wzrjuZIXihnBTgs8Fwt6047bEfuni/gt2SGR/yWq4Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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