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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f8622d3d5c9983a83305afee9a96126263d0ac80f8ec25acd0d3b91cc8ddf6' 
  AND token = 'PDR9ypMSQmYCKcbS+d4N8hrvUJNHouW2pZlgmpnU/l4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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