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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7879480ec78b9372e0e3b959a48e6ee23ed80a216b9a6bd37232500aba6b6c3f' 
  AND token = 'NCwM/DPOx13fpLQqcdrDJVcWNHX0lwhLZroyZm9ZQZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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