Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ce3b25b2d6acc41662823ce2362c197dd7241f81388284e9ee8e255f0a2d33d' 
  AND token = '4BdrRwee81RpkRpwiVEQL117yuMedU+lXxsunX34o2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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