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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b159cc8c32119e25ba3606c49fc4a047f5d91b5ff0444b86b3eea6ac8d3f79b' 
  AND token = 'WaecrR10bSYvYf9g3Vw2rZv7KkgQgmGgVpezdj//96g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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