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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee4cefcb451a377dbfab02d9ba6706aa6d2fe2785ddcddb7bd8f81f89c337be' 
  AND token = 'sSvsdbVTW9c9KPIvi8Vu5xN1nNAx893XjEfXJ/FQWe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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