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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4636d571ae9fbeb9cff7d2e36089493db7ed2670e8a4f2c826f6bd7fc7f9a6ae' 
  AND token = '8V+C6lW1AiaiAhYiNd5hfV9gfaXSi1nxcoaBkJbO37w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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