Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd80406e8551966a0a7f54ea7caf2abfd8b5c01bbebf275a5cb49dd0ddee1c2' 
  AND token = 'awhkNqJ/7HPsh21tvlcnRHpzUfA7SH76YoKGqZxS80o=' 
  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"
    }
  }
}