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SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '4254f1bdb272fea312def6880860d380327e3f38a444b2942d32d36c72dbf5c8' 
  AND token = '7HP574LcGcOD0ffwcNRU3IMaPEW+fvrQqy9/ab3+ZII=' 
  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"
    }
  }
}