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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce39d8d96e8f6c96a40b8ca1f8c59b495a5843960713b726668cd60379ebeca7' 
  AND token = 'eFWbe67qJAkIYgLKE4Gj8QmdpjLHl8eHmtmJ9MWZe2Y=' 
  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"
    }
  }
}