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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55f333916c1aa47b69ec36500551e279c4ab05eaf75c1b2ca064356837524f8' 
  AND token = 'u/061IMh6HtXtFax1qWK8n6WyTc33YeQOzf5hAkjArw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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