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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'b3492805b9fed538506912aa5ff3a6fa0a9c5ee0d91f58d0b7d8f8474350a20b' 
  AND token = 'qt94W7cB1WWqiZDif1B6MjoAEifjE4RrO4J2PUpuqgc=' 
  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"
    }
  }
}