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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '323f8ef50dc07e5e157161cc1e7844c209d45aacecbf9e4a857a767f1cc90d5a' 
  AND token = 'kL0V8jH8q9FDROJqc239jWWpMs4DC6ariya3KmhAhxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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