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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33e37f9faeb7308bfb4f4266fec5cb63b0dd3576564deeddbf76a43533d2a301' 
  AND token = '9Fw2OIzjbuYZH3phk7yBApVo9tuUaQ7GJriUtKmgTto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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