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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a70767503cf55e8bdb216534831037302948735260ce25ff624458b9f20fd64f' 
  AND token = 'IAgjsjxeVRpXH96FxsZ8hbY8hO1Y78bmU34xABvbZMM=' 
  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"
    }
  }
}