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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5979ca16de4806d4f3a7d5554e808fb0bb3661d1fa4007c87ba0356d155dd5b' 
  AND token = '8fZn3dL9wqWveduBZRY/uXml/cNvv/24pMyUeSPqKGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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