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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '069f21d0640e69674e941c4153cfd22c7464304b211312d13860cd10846c61b4' 
  AND token = '7FPvauFnqh2azcGK3T9dqWljwItud7BuFBPmNTbVYnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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