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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26dbfea03aa43440bc15df2435e6885730407b095debad526a88707175023ede' 
  AND token = 'cYsGQPiHttnw67lAi4FXphjyrOG2Jhkyeeg8P0TKInc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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