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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf1d45bcf915f7c34769df359866cfb67071f067356d8ddca698c7ffc2d9f10' 
  AND token = '5VoX5ZJLhmstsRO7qZMXJJRCz/W83CaT23zhIP6N/gI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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