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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9337a895c83cb0a6afa3ce3ba9d5d24fab8cda11d4bcdc9536fe63039794152f' 
  AND token = 'DjYTnRIfPMSujfy2z1bkHOOE6BuJOiBbDqqK7jD7eok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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