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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69171cca8e79db542fdba32f3c15f3e5bede7cc71de18056c32c4773dfcb1402' 
  AND token = 'Ui1e+/9R7rJ87nQKz4+UfWrpT3zKD+3kRg4AHyHh/zQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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