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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36db3dd1d609011e0bdf2fc8a1bfa50a6b99ba3767de9bb322ed8d475ff61d21' 
  AND token = 'vwi0cZc7VkLA2uiatQybDYsao4jGX93y8bG1kIxQDFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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