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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87595c9ddf52d26172dfea60c4c6cac753b90acb4f28679e34bd8cc10ed4b579' 
  AND token = 'g3XF+fnfq930sDEci7XuT1o5ROQS4/zX7MYzHT6dxRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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