SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '549a7d1491bba60bb76456c40c625b854d0fd33413b927f3b350a5306388c775' 
  AND token = 'oBNEWK3vq5TUh+qnPGgXf2Odept6FIcyY+qAeHuUx1Q=' 
  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"
    }
  }
}