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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a4b8ab3ec7bf988f595f7b120fd4ff95293afe18dab88b48f3f83ce18a50643d' 
  AND token = 'crF9hLN1b5LpvZuY2I7HwazdESClA5NdoHpeBVbp/Gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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