Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '374853602e43a338c2828d347508ec52f4cf3e8cf2232d728bf123bf413dabc6' 
  AND token = 'v40rgs28BTN4jMiKu/TTEdozeAkdMtme3p/ue7GgAYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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