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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5142c9ece089d67e2fd93eb6ae3efef1d55d83ea6d809bbb04463be58a7a4866' 
  AND token = '0/ciup5SFimIOHs5jEsfg8meGL5N6dNA/YbuU0MsBIY=' 
  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"
    }
  }
}