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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a3e261c830f89e58eb1858e891cf0fc12ac9bdc9b65d030451dd2ab6dffd74' 
  AND token = '9qkQrSAvHiL5gR55UNFzLg76yVmkEQWi3N/S7YWFAng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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