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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b39a7b4eab38ca9b25648f17a7d6b7d8cd10105524749c7be993654f28b4958' 
  AND token = 'j1ikBWEA2xr2xSO5uGQvkG/B5TLBstc78FTvIJyCeco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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