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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e9186c8d468ee3b9a2ab19b1e2be648ac6525b6628dabf32be0b233353b2435' 
  AND token = 'AI2m+PNKWRLbC+S23ofym6GSkJt8P+0UoDFO/43nE5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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