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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e01e4bd28a091f2e719a23a9a094343437321da0bef92fd611b07b4bbbb78ef' 
  AND token = 'tvtSEzYjzhnpGQPTfG8Y1MJiB/wRGkybxkZeqS5nXOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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