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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7083fd0b807cfc8aacf482a555f3e04eab82b71f10f747381dd699319bee34c' 
  AND token = 'L6CyjcxgPQ/AQoIqxyuW1tWBKndP11b6YY5cTHsnD7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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