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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd755d3addb28e771f4312fc17196e4d0dab43ade82c9011ed5132ae62ee33619' 
  AND token = 'Yc/l9WQo4/AB301GN4z9FLZpiwzcQimhbPDdpQTvH2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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