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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cce49f751ce9b3a119085091060de695c0eb34db1b1ac6d0097fc4b9284ea6' 
  AND token = 'jRCZ0KAsbtWyG7vReKl9W2MzMKRnJUTW+N5EcfDU8Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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