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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8d32f7f85e360a8ac80c2a59d920e85b8ff26b6ea90ad4b53de98ca3706d30' 
  AND token = 'rLMvY/D1OHkiILzsQLhGnxvcjnKyTXfzzXfgjWGz61k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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