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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '0a173e3696546de45f40027f73e158d0cff45b61bce83afe3f566e3a896eaf34' 
  AND token = '0BC762LHt+0smtCsNhpvT+5mcFbRqJCUqh667v/RfR0=' 
  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"
    }
  }
}