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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1107113fb77fc6bdff8b558db22354c87109572a929f696a6b6d68195dbebe62' 
  AND token = 'ZG1F7n7v5HguNZTIdJTf3K11lBrZCUDle8oXjZSEw7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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