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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '148d5acfdc2429dffd51fef0181f058cb0f3d0c7075f9c9afeb1bbcee91e88db' 
  AND token = 'Q/pKAWjXfyAhzv7XQe6rn6Tih4+uHvkRfN2hXAfHyWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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