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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf95977f92e64a8c0aa6c9df8fe5e27df713f538b53fb4614482341621703e4' 
  AND token = 'bQv1XhCoE9hMOkfnPmNxx8cUz6r+Y6h6Xr6m6TF4IfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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