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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492fb4a81b386cae03e9ef1fc2851a4f68e6fffb10507047ff955ebd5fb76533' 
  AND token = 'gPMmJnUkhtj1msY6rC4eEx85Wj6h4mNb4BctQwW98aE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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