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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '1ad6224deef200dd287c6f19d121ce9de7a5e8a5ba9660c81b01d3e766f38621' 
  AND token = 'g3rHLP0lzMdulOCPK4ukVs76VjLASSC4dhMjY3ql/zU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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