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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d71ac6a982a10f9267654771c0e8a3eaec4f251dc0e4ce1887754052eaa59f' 
  AND token = 'QK03tJJ8owWuNRdc8gKu2LzjSV0JlcVI+fzmnDJfLbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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