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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '3bb711e145890afb0611089337f2d70ed1c6d4d0c762d3532274ff686b59f914' 
  AND token = 'pEa6nJiYPUyyzSX7Rr7uaGtE+t16FoV38FbHX/dYq9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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