SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af87324baf25b31f248f8d1c153f45431afe51903c5e235615a7510aea4cf896' 
  AND token = 'mEUvtrpkJEIZPvjV+mKzlx/cKoQcEEzVhvyUPzQH4Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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