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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adbffa78425a5db4fd7d7dd961eb46d28353e134f1ae969b375dbea3088d6f33' 
  AND token = 'SiWBdg8ITDO4OoHpuojLZZI0TKvTw2DTh8AdfF4y/gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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