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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd94476b17b812098cfa3516be3e6f1f6f0f62bed37a69b5b5581dd3bead8e38' 
  AND token = 'MOFm3ZBFDbdaz+VlDRQubm3H1kzvmsXEhORhaBe9Ul0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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