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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f3e8ad65b8eddad22fb8daccafb5887fe068f0c596a6be2017d8337f5e7c548' 
  AND token = 'dDnE2RvQl00tsGI/XU6MWTdDbiZRoYk+WmyD093a/Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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