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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41b8f8ba744c5ccb84d349d7b9525d782e7277481d7dddf2ad28c000ab3e6e6' 
  AND token = 'iNZuQuraJVcAk7sWdoj7nPJK8pr94BW0flLfSE7AEBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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