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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3efec32b58f74886656724dca8e89c6e49abc548c3f17230515af609211fcf13' 
  AND token = '7nJd2bJOUC0VpAwWfDs4uqzN/CE5ruOw6gJtaBoUyW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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