SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '2709bbe73a7f3926c7cf83caba62c8cfc834e627dfb015f1db001b44f0de1d5d' 
  AND token = 'jxP9m7B8QzmW30BnSIFuRMatvMnWwXSgwZ+fSzOZB2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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