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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cdfc101ac5e97903115e98660ce43c0d69e713f1c1398744f5f5753817d7bb4' 
  AND token = 'KhWZgw+4nA/mwh5Nx08drwDKcvE5vnqi1IazQoM3F7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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