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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f947d71855203fd9b411c902301d9f3afbdf44f14902920a2d4b14dbeac4b816' 
  AND token = 'D+gFm+tqRviyo+mtzaBXgBN/a7lsv4yoLW4NaJfEdo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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