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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05ac262be8db312e248c6f279019ceaf9403dbd66a913ed93f9e0e62572d90f' 
  AND token = 'oD6C8f2W8RxCen5TzTampTN74NkAmAy7x+gk4kdW0QU=' 
  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"
    }
  }
}