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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'ca9042afc654c1f085439c5409f7e87f26918f1944d6d6355841c199c7049812' 
  AND token = 'FLFS7tXyw41dMR0lLtL6f1ppLaY/qUT1N24XGUcWw1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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