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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '5a4691ffe4e24274434b748749442ca423feffe01aa4e01463cd1cfb4fc716fc' 
  AND token = 'pInQNg5ITaU9pAvGIEu6v0tGnAb5hhVT42r/odWxY9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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