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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832f1f34dd35b8c9495aa3497bbf130e15bca10f3a0bdb0304bf9418ba66e13a' 
  AND token = '54dnZmVScJ9ItUVALwKjc8wurysOOB5QpF6wrsXw0mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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