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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8433df25d5956eefde45ef0b7f8a1eabb37c0f68c7b00f7696bd7c76bde130' 
  AND token = '8UNzWnyfaAUWxGufN+7IVdSRKgriZ+OjEr0lKQxndBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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