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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2230d5e2296036bbe4f35b4af21e31e2a8eb2cc50b27081a3632370cf43263f3' 
  AND token = 'gBWBvJqnnYNyJH8iYQsdIw1ezH7D7X60iPe3fRO36ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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