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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13add012a1a3b77b12be75f02a7eed82a6a65c7f6e2fb146d5778d4e2b9effcd' 
  AND token = 'arTTiRkzwoef/LD7A0OgCNT89FXvr8lqHMooQsOQoW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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