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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb13988938cd1c0905a9248a972a2cc2ce9a53572893aa9ee0dc77065a4b832' 
  AND token = 'xNun3dRa/nrNivv28jVDZh8OXIj+WCfzFfkhvqChtMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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