Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd74a6f5ee5e236f81a44d2baf316fbf915f830b5a6e1c4b4d2867e54a83c5e' 
  AND token = '4JN0HZVS3yItQAKngSgQVVR3e9S9sNf/c64j17Lk+gA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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