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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c8a520a83fd312c2d7cf4ee0ab87d1009c261fd0e936694558e080ed5af20e4' 
  AND token = '0+AsDhp0YJxUb47DaH9vDB/xkDNElDdWFM5nVqE9Lsw=' 
  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"
    }
  }
}