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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb977a3d4c9013be94159ed7ecda6c24cd4e1dd21a47d7c35f62af29d8c0726f' 
  AND token = 'iB3p9Maj1QQrXjdRJlowuyvGt5yZeHUTkIlWzu3LVSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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