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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b985b593abd051a78bc74dd2ee124f2a07474f08e3d3f5734d3514362dd2f36a' 
  AND token = 'oj4CYz4UEVK50nHMwKnNnSfv2+acUHOVHFILehOqz2M=' 
  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"
    }
  }
}