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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8efc40108e0ea62236f2a58e28b192f4ead6c124efa63ddf8c4476059216c04d' 
  AND token = 'FmkuXiCZ5YGmFa9ycyoaH/HvzYJEG9ZRQNjPLiYZGUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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