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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '765011d1aac6d046ddd08ab8c18ccc520c72f2d75ad050ee2ab67cd3b4c44710' 
  AND token = 'qA5EX5hqkO8iRBjRh+m4LZHTOa01HGCQD+7w79EvapY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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