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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29ee89036ce64c10d5f25049d9fc5f163154e3ae0c621338d8215c3872994ba' 
  AND token = 'g5OrxLAkVj31a9/ZoTk2qZYbZu8nTCx2yyfnimqjqPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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