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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'cd408136f4444081064845e3f58c22578fea37daab3fc9224f68d1fe54998487' 
  AND token = 'IODSzBe3nDwUBojk7oE2zm9wbRUNrUpXQVP4mdAt47M=' 
  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"
    }
  }
}