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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'a0f3fd3f2cef9475044043c586224bcac975bf875e5df47b46cf13c404192222' 
  AND token = 'eOIKRv2ID0EVpMRU1KDi04YfNJ2CwwWbjT29VD8jL08=' 
  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"
    }
  }
}