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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c36dd2fc604f1f79a6b14b8ace7dc241e1d0d969e8c407e42ff9e6cfebd278' 
  AND token = 'UxjfPO1ieUMu3u9E0xD3gGiTsHyPRDEXP2miBxgoowk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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