Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '398e85cebb619d86022beab675833e54fbacde2c0c1a000e07bc29172fc8b68b' 
  AND token = 'rYzY5apRS6XceAqQKLuRPVq2WM/fWF7Cw3nUoPJ2h3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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