SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b7abad9c893940d66735c315dcb93d568e242e45f2e16b814716db7f219918d' 
  AND token = 'cd8qykLfTJ/iY/v53HttZhirAFsjzIdpxtkHtZQ2NXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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