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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65ffccf9c9b63bd54470fbcd96d0604696da2498b93b4efa75237b0466bce658' 
  AND token = '06y69UQMUFs0JqWZVau/vVlsInIML9icc08LZIj545c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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